[LTP] [PATCH 2/9] tst_net.sh: Check for disabled IPv6 in legacy tests

[Petr Vorel]

Hi,

merged, with change: using [ "$TST_IPV6" ] instead of [ "$TST_IPVER" = 6 ] in
both cases where tst_net_require_ipv6 is used.

Kind regards,
Petr